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Hi Scott, <br />I'm making an assumption here, forgive me if I'm wrong, that by drift you mean the tunnels, I don't think any two will be the same. Back in the mid 70's I went down the Point of Ayr colliery in North Wales where the tunnels were at least 9' high. The working coal face, which was under the sea, was about 6' high. That area of Wales is full of mines, lead mining was a big industry and there are pits there from Roman times. These were just a few feet wide and dropped vertically for about 20' or so. <br />Cheers, <br />Kim <br />[tup]
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